Re: Multipass-Rendering with IRIS-Performer

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Angus Dorbie (dorbie++at++multipass)
Fri, 12 Dec 1997 15:02:14 -0800

No need for accumulation, just use draw callbacks to enable a
glBlendfFunction( of GL_ONE, GL_ONE) After you set pfTransparency
of PFTR_BLEND.

It's much faster.

Cheers,Angus.

On Dec 12, 4:32pm, Volker Meier wrote:
> Subject: Multipass-Rendering with IRIS-Performer
> Hello Performers,
>
> We are trying to do the following 2-pass rendering strategy:
>
> 1) render the scene with diffuse illumination and texture enabled and
> store the result in the accumulation buffer,
> 2) then render the same scene again with specular illumination only and
> texture disabled and add the result to the accumulation buffer,
> 3) finally write the accumulated scene back to the frame buffer.
>
> It seems to us, that there is no direct Performer support for this task, so
> we're trying to do this directly with OpenGL calls in the draw callback.
> However, all we get is lots of OpenGL error codes.
>
> Is anybody out there who has already done multipass rendering in Performer
> or has some source code for this?
>
> Besides I'm also interested in source code examples for the convolution and
> colortable extensions on a OpenGL basis.
>
>
> Thanks in advance,
>
> Volker Meier
>
>
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>-- End of excerpt from Volker Meier

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